3
Metals and Non-metals
Multiple Choice Questions (MCas)
Q. 1Which of the following property is generally not shown by metals?
(a) Electrical conduction (b) Sonorous in nature
(c) Dullness (d) Ductility
Thinking Process
Metals are not dull, they have a shining surface That is metals are lustrous. The
property of a metal of hauing a shining surface is caled 'metallic lustre
Ans. (c) Ametal has a shining surface only when it is fresh The metals iose their shine or
brightness on keeping in air for a long time and acqure a dull appearance due to the
formation of a thin layer of ox1de, carbonate or suiphide on their surface.
If we rub the dull surface with a sand paper, the metal objects becomes shiny and
bright once again
Q. 2The ability of metals to be drawn into thin wire is known as
(a) ductility (b) malleability (c) sonorousity (d) conductivity
Ans. (a) These are all physical properties of metals The ability of metals to be drawn into thin
wire is known as ductility Malleability is the property which allows the metals to be
hammered into thin sheets
Sonority or sonorousity is that property of metals due to which metals make sound
when hit with an object. Conductivity allows heat to pass through metals easily.
Q. 3 Aluminium is used for making cooking utensils. Which of the following
properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
(a) (i) and (ii) (b) () and (ii) (c) (i) and (iii) (d) () and (iv)
Ans. (d) Good thermal conductivity. malleability. ight weight and high melting point are the
properties of aluminium due to which it is used for making cooking utensils.
, ) Solutions
32 NCERT Exemplar (Class
one of the following metals do not react with cold as well as hot
2.4 Which
water?
(a) Na (b) Ca
(d) Fe
(c) Mg
Thinking Process chermical reactvity
with water depends on its
fne irtersty of reacton of ametal
reacts Witn not Water
Cal read with cold water Mg metal gold do not react
Ans. (d) Some netals lie (Na. Kand Metals Bke lead. copper silver and
but Zn and Fe reat with stearm forn iron (l1, 1)OXI0e an
Red hot iron reacts with stearm to
wn water for even stearm)
hydrogen
3Fels+ 4HOg)’ Fe0,(s) +4H,T
Sear
be obtained on prolonged
Q.5 Which of the following oxide(s) of iron would
reaction of iron with steam?
a) FeO (b) Fe,0,
(d) Fe,0, and Fe,O,
(c)Fe,O.
Ans. (c) Reactions of iron metal with water
Fels) +HyOFe0 + H,(g) T
iron (l)
iron )
ZFe(s)+ 3H,0’Fe,0, + 3H,(g) ‘
iror (l)
Sigem
3Fe+ 4H’FeO, + 4H, 1
iron (, W)
with water?
Q.6 What happens when calcium is treated
(i) It does not react with water.
(ii) It reacts violently with water.
water.
(iii) It reacts less violently with
calcium.
(iv) Bubbles of hydrogen gas formed stick to the surface of
(a) i) and (iv) (b) (ii) and (ii)
(c) G) and (i) (d) (ii)and (iv)
Ans. (d) Caciurn reacts less violentiy with water and the bubbles of hydrogen gas produced
stk tothe suriace of cacium. Due to whiCh it fioats over water surface
Cals) + 2H,O) ’ Ca(OH),(aq) + H,(g)1
Caium hydrode
Mch less heat is produced in tnis reacton OUe to which hydrogen gas formed does
rot catch fire.
, Metals and Non-metals 33
Q.7 Generally metals react with acids to give salt and hydrogen gas. Which of
the following acids does not give hydrogen gas on reacting with metals
(except Mn and Mg)?
(a HSO. tb HCI (c) HNO, (d) Allof these
Thinking Process
Very dlute ntrc Kd however, reacts with magnesiuM and manganese metals to
evohe hydrogen gas This is because, very dtlute nitric acid is a weak ox1d1sng agent
which s not abie to oxdise hydrogen to water
Ans. (c) Nitric acd(HNO,) does not give hydrogen gas on reacting with metals (except Mn and
Mg) because nitric acid is a strong oxidising agent so, as soon as hydrogen gas is
formed in the reaction between metal and dil HNO,. the HNO, OxIdises this hydrogen
to water
Q. 8 The composition of aqua-regia is
(a) Dil.HCI:Conc. HNO, (b) Conc. HCI : Dil. HNO,
3:1 3:1
(c) Conc. HCI: Conc. HNO, (d) Dil. HCI: Dil. HNO,
3:1 3:1
Thinking Process
Aqua-rega is afreshly prepared mixture of two conc. acids.
Ans. (c) Conc. HCi and conc. HNO, in 3:1ratio form aqua-regia.
Aqua-rega is a highly corrosive. furning liquid. Itcan dissolve all metals even gold and
platinum also.
Q.9 Which of the following are not ionic compounds?
(i) KCl (ii) HCL (ii) CCl, (iv) NaCl
(a) () and i) (b) (ii) and (ii) (c) (ii) and (iv) (d) () and (ii)
Thinking Process
lonic cormpounds are the result of electron transfer.
Ans. (b) HCI is a polar covalent compound while CCI, is a non-polar covalent compound
because both are formed by sharing of electrons.
KCiand NaCiare formed by the transfer of electrons and are ionic compounds.
Q. 10Which one of the following properties is not generally exhibited by ionic
compounds?
(a) Solubility in water (b) Electrical conductivity in solid state
(c) High melting and boiling points (d) Electrical conductivity in molten state
Thinking Process
Concern the ionic properties of metals.
Ans. (b) tonic cornpounds can Conduct electricity in molten or aqueous state only. In solid
state these are non-conductor of electricity because of the absence of free ions. In the
solid ionic cornpounds, the ions are held together in fixed position by strong
electrostatic force and cannot move freely.
So, electrical conductivity in solidstate is not generally exhibited by ionic compounds.
Metals and Non-metals
Multiple Choice Questions (MCas)
Q. 1Which of the following property is generally not shown by metals?
(a) Electrical conduction (b) Sonorous in nature
(c) Dullness (d) Ductility
Thinking Process
Metals are not dull, they have a shining surface That is metals are lustrous. The
property of a metal of hauing a shining surface is caled 'metallic lustre
Ans. (c) Ametal has a shining surface only when it is fresh The metals iose their shine or
brightness on keeping in air for a long time and acqure a dull appearance due to the
formation of a thin layer of ox1de, carbonate or suiphide on their surface.
If we rub the dull surface with a sand paper, the metal objects becomes shiny and
bright once again
Q. 2The ability of metals to be drawn into thin wire is known as
(a) ductility (b) malleability (c) sonorousity (d) conductivity
Ans. (a) These are all physical properties of metals The ability of metals to be drawn into thin
wire is known as ductility Malleability is the property which allows the metals to be
hammered into thin sheets
Sonority or sonorousity is that property of metals due to which metals make sound
when hit with an object. Conductivity allows heat to pass through metals easily.
Q. 3 Aluminium is used for making cooking utensils. Which of the following
properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
(a) (i) and (ii) (b) () and (ii) (c) (i) and (iii) (d) () and (iv)
Ans. (d) Good thermal conductivity. malleability. ight weight and high melting point are the
properties of aluminium due to which it is used for making cooking utensils.
, ) Solutions
32 NCERT Exemplar (Class
one of the following metals do not react with cold as well as hot
2.4 Which
water?
(a) Na (b) Ca
(d) Fe
(c) Mg
Thinking Process chermical reactvity
with water depends on its
fne irtersty of reacton of ametal
reacts Witn not Water
Cal read with cold water Mg metal gold do not react
Ans. (d) Some netals lie (Na. Kand Metals Bke lead. copper silver and
but Zn and Fe reat with stearm forn iron (l1, 1)OXI0e an
Red hot iron reacts with stearm to
wn water for even stearm)
hydrogen
3Fels+ 4HOg)’ Fe0,(s) +4H,T
Sear
be obtained on prolonged
Q.5 Which of the following oxide(s) of iron would
reaction of iron with steam?
a) FeO (b) Fe,0,
(d) Fe,0, and Fe,O,
(c)Fe,O.
Ans. (c) Reactions of iron metal with water
Fels) +HyOFe0 + H,(g) T
iron (l)
iron )
ZFe(s)+ 3H,0’Fe,0, + 3H,(g) ‘
iror (l)
Sigem
3Fe+ 4H’FeO, + 4H, 1
iron (, W)
with water?
Q.6 What happens when calcium is treated
(i) It does not react with water.
(ii) It reacts violently with water.
water.
(iii) It reacts less violently with
calcium.
(iv) Bubbles of hydrogen gas formed stick to the surface of
(a) i) and (iv) (b) (ii) and (ii)
(c) G) and (i) (d) (ii)and (iv)
Ans. (d) Caciurn reacts less violentiy with water and the bubbles of hydrogen gas produced
stk tothe suriace of cacium. Due to whiCh it fioats over water surface
Cals) + 2H,O) ’ Ca(OH),(aq) + H,(g)1
Caium hydrode
Mch less heat is produced in tnis reacton OUe to which hydrogen gas formed does
rot catch fire.
, Metals and Non-metals 33
Q.7 Generally metals react with acids to give salt and hydrogen gas. Which of
the following acids does not give hydrogen gas on reacting with metals
(except Mn and Mg)?
(a HSO. tb HCI (c) HNO, (d) Allof these
Thinking Process
Very dlute ntrc Kd however, reacts with magnesiuM and manganese metals to
evohe hydrogen gas This is because, very dtlute nitric acid is a weak ox1d1sng agent
which s not abie to oxdise hydrogen to water
Ans. (c) Nitric acd(HNO,) does not give hydrogen gas on reacting with metals (except Mn and
Mg) because nitric acid is a strong oxidising agent so, as soon as hydrogen gas is
formed in the reaction between metal and dil HNO,. the HNO, OxIdises this hydrogen
to water
Q. 8 The composition of aqua-regia is
(a) Dil.HCI:Conc. HNO, (b) Conc. HCI : Dil. HNO,
3:1 3:1
(c) Conc. HCI: Conc. HNO, (d) Dil. HCI: Dil. HNO,
3:1 3:1
Thinking Process
Aqua-rega is afreshly prepared mixture of two conc. acids.
Ans. (c) Conc. HCi and conc. HNO, in 3:1ratio form aqua-regia.
Aqua-rega is a highly corrosive. furning liquid. Itcan dissolve all metals even gold and
platinum also.
Q.9 Which of the following are not ionic compounds?
(i) KCl (ii) HCL (ii) CCl, (iv) NaCl
(a) () and i) (b) (ii) and (ii) (c) (ii) and (iv) (d) () and (ii)
Thinking Process
lonic cormpounds are the result of electron transfer.
Ans. (b) HCI is a polar covalent compound while CCI, is a non-polar covalent compound
because both are formed by sharing of electrons.
KCiand NaCiare formed by the transfer of electrons and are ionic compounds.
Q. 10Which one of the following properties is not generally exhibited by ionic
compounds?
(a) Solubility in water (b) Electrical conductivity in solid state
(c) High melting and boiling points (d) Electrical conductivity in molten state
Thinking Process
Concern the ionic properties of metals.
Ans. (b) tonic cornpounds can Conduct electricity in molten or aqueous state only. In solid
state these are non-conductor of electricity because of the absence of free ions. In the
solid ionic cornpounds, the ions are held together in fixed position by strong
electrostatic force and cannot move freely.
So, electrical conductivity in solidstate is not generally exhibited by ionic compounds.
